So I realise this thread is somewhat old but I am having the same issues on my 4 year old UK based Panasonic (TX-P55VT50B).
Fortunately it is covered by a 5 year Panasonic warranty and after having got the local service depot out they have and trying the Panny service bulletin (set VSUS to high and increase the blue drive - no improvement, but no pot tweak) they have reported back to Panasonic who agreed to replace the panel and ordered the part from Panasonic.
The part arrived and they arranged to replace today, however they rung up and now want to take it away to repair as its quite a long job. I am relatively ok with that, however the timing is bad as I am away at the back end of the week so want to be around when they come back and don't want the family to be without a set for a week or more.
So I might ring back and delay the repair till after Christmas as to make sure there aren't any problems.
My TV has been calibrated so am also reluctant to have the panel swapped without trying the pot adjustment.
So after reading the entire thread
my questions are:-
1) Anybody have the part number of the 55 panel, just don't want them to take away set for them to have gone oops wrong panel. I am quite surprised they are still available given the length of time they have been out of production. I have found a part number for MD55F15A7J based on a TC-P55VT50 manual but not sure if that is for a US version as I know as when calibrated I used normal as the ISF Day output is too low.
2) Ideally would like it done at home, should I insist or is it worth doing in workshop?
3) How are the pot adjusted ones holding up ? Was there a need to recalibrate?
4) Is it still going to go again? I have measured the temperatures with a spot temp gun and they are higher as people have said in the affected areas.
Any other opinions, ideally want to have a working VT50?
Any help grateful